EP3173684B1 - Lighting module of a motor vehicle headlight and associated headlight - Google Patents

Lighting module of a motor vehicle headlight and associated headlight Download PDF

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Publication number
EP3173684B1
EP3173684B1 EP16200007.9A EP16200007A EP3173684B1 EP 3173684 B1 EP3173684 B1 EP 3173684B1 EP 16200007 A EP16200007 A EP 16200007A EP 3173684 B1 EP3173684 B1 EP 3173684B1
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EP
European Patent Office
Prior art keywords
light source
lighting module
air
light
converter device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16200007.9A
Other languages
German (de)
French (fr)
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EP3173684A1 (en
Inventor
Stephan Sommerschuh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP3173684A1 publication Critical patent/EP3173684A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/49—Attachment of the cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F21V29/673—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans the fans being used for intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/29—Attachment thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the present invention relates to a motor vehicle headlamp lighting module, of the type comprising: at least one first light source; a device for converting the wavelength of the light emitted by said first light source; and a fan able to generate an air flow.
  • So-called adaptive light devices make it possible to adjust the intensity, dimensions and/or direction of the beams according to traffic conditions, in order to fulfill these different functions.
  • Each headlamp generally comprises several lighting modules which make it possible to form a light beam from the headlamp.
  • the modules can be switched on or off independently of each other to vary the characteristics of the beam in real time.
  • lighting module is meant an assembly containing at least one light source and an optical projection or reflection system.
  • the document US 2011 280033 A1 describes a light module comprising several light sources whose light is guided towards a wavelength conversion device, the latter being cooled by air sent by a fan into an air duct.
  • Lighting modules as described in the document EP2690352 in the name of the Applicant, comprise in particular light devices comprising light sources of the laser diode type, emitting blue light, as well as a device capable of converting the laser radiation into a beam of white light.
  • a conversion device is for example made up of phosphor elements.
  • the object of the present invention is to propose an improvement of existing lighting modules, in particular by optimizing the efficiency of the cooling of the various elements emitting heat.
  • the present invention as defined in claim 1, relates to a lighting module of the aforementioned type, comprising at least a first and a second distinct air ducts, the fan being placed at the inlet of each of said first and second air ducts of so as to distribute the air flow between said ducts, the first light source and the wavelength conversion device being respectively arranged at the outlet of the first and second air ducts.
  • the invention also relates to a motor vehicle headlamp, comprising at least one lighting module as described above.
  • FIG. 1 shows in section a lighting module 10 according to one embodiment of the invention.
  • the lighting module 10 is intended to be incorporated in a motor vehicle headlamp, said headlamp optionally comprising one or more other lighting modules.
  • the lighting module 10 comprises a first 12 and a second 14 light devices, a wavelength conversion device 16 and an optical system 18 for imaging.
  • the module 10 further comprises a fan 20, able to generate an air flow.
  • the module 10 further comprises a support 22 to which are fixed the first 12 and second 14 light devices, the conversion device 16, the optical system 18 and the fan 20.
  • first 12 and second 14 light devices are substantially identical and correspond to the same description below.
  • the light devices 12, 14 each comprise a light source 24 arranged along an emission axis substantially parallel to X.
  • the light source 24 is a semiconductor light source, more preferably a laser diode.
  • the light source 24 of each of the light devices 12, 14 is a laser diode.
  • the laser diode 24 for example emits a visible beam whose wavelength is between 400 nm and 500 nm, preferably between 440 nm and 470 nm.
  • the light devices 12, 14 each further comprise an optical device capable of concentrating the beam emitted by the laser diode 24.
  • the light devices 12, 14 each further comprise a reflector 26 able to send to the conversion device 16 a light ray emitted by the laser diode 24 and concentrated by the optical device.
  • the reflector 26 is movable in one or two directions, so as to form a scanning system.
  • the reflector 26 is formed of several independently movable mirrors. The movement of the mirrors of the reflector is notably controlled by an electronic card 28.
  • the luminous devices 12, 14 further each comprise an envelope 30, containing the diode 24, the optical device and the reflector 26; and a heat exchanger 32, assembled to the diode 24.
  • the heat exchanger 32 is preferably a finned radiator made of a material with good thermal conductivity such as aluminum.
  • the envelope 30 has a side orifice 34 allowing the output of the light ray emitted by the diode 24 and deflected by the reflector 26, towards the device 16 for wavelength conversion.
  • the wavelength conversion device 16 is for example formed of a plate 36 of a substrate reflecting the laser radiation, on which is deposited a continuous and homogeneous layer 38 of phosphor.
  • the plate 36 is for example made of aluminum.
  • Phosphor layer 38 is arranged in a plane (Y, Z).
  • the first 12 and second 14 light devices are respectively arranged above and below, along Z, of said layer 38.
  • the plane (Y, Z) of the layer 38 is close to a focal plane of the optical system 18.
  • Said optical system 18 comprises for example one or more lenses 40.
  • the support 22 of the lighting module 10 comprises two distinct elements, more precisely a plate 42 and a housing 44.
  • the plate 42, the housing 44 and the wavelength conversion device 16 are shown in exploded perspective in picture 2 .
  • the box 44 is shown from the back to the picture 3 .
  • Plate 42 and the housing 44 are assembled together, for example by screwing.
  • Plate 36 of device 16 is held between plate 42 and housing 44 along axis 23, phosphor layer 38 being oriented towards plate 42.
  • the plate 42 has a substantially parallelepipedal shape with walls respectively arranged along planes (X, Y), (X, Z) and (Y, Z).
  • the plate 42 notably comprises a front opening 48 and a rear opening 50, respectively made in each of the two walls arranged along (Y, Z).
  • the plate 42 is assembled to the optical system 18 at the level of the front opening 48.
  • the plate 42 is also assembled to the plate 36 of the wavelength conversion device 16, at the level of the rear opening 50.
  • Plate 42 also includes an upper opening 52 and a lower opening 54, respectively provided in each of the two walls arranged along (X, Y).
  • the plate 42 is assembled to each of the first 12 and second 14 luminous devices, at the level of the upper opening 52 and the lower opening 54 respectively. the side orifice 34 of the casing 30 of the light device 12, 14.
  • the housing 44 also has a substantially parallelepipedic shape.
  • the case 44 notably comprises a bottom 60, arranged along (Y, Z), and external side walls respectively arranged along (X, Y) and (X, Z).
  • the housing 44 comprises two internal walls 62, 64, arranged on either side of a plane of symmetry (X, Y) of said housing, said plane of symmetry passing through the optical axis 23.
  • the internal walls 62, 64 rest on the outer side walls arranged along (X, Z) of the casing 44.
  • the internal walls 62, 64 divide the interior of the casing 44 into three separate ducts 66, 68 and 70, isolated from each other and contiguous along Z.
  • the casing 44 comprises a central duct 68 and two lateral ducts 66 and 70.
  • the bottom 60 of the box 44 comprises three openings 72, 74 and 76, contiguous along Z. Each of said openings forms an inlet of a duct, respectively 66, 68 and 70.
  • the fan 20 is assembled at the bottom 60 so as to cover the openings 72, 74 and 76. Thus, an air flow generated by the fan 20 is distributed between the three separate ducts 66, 68 and 70.
  • the radiator 32 of each of the luminous devices 12, 14 is arranged inside the casing 44, in one of the two side ducts 66 and 70.
  • an air flow passing through each side duct is capable of cooling a diode 24 via the corresponding radiator 32.
  • the plate 36 of the conversion device 16 for wavelength conversion is arranged at the outlet of the central duct 68, in contact with the edges of the internal walls 62, 64, opposite to the opening 74.
  • the housing 44 comprises holes 80 near plate 36, to form an air outlet from central duct 68.
  • a flow of air passing through said central duct 68 is capable of cooling plate 36.
  • the position of the internal walls 62, 64 is configured so as to direct onto the plate 36 of the conversion device 16 a fraction comprised between 10% and 40%, preferably between 15% and 25%, of the air flow generated by the fan 20.
  • Each radiator 32 therefore receives between 30% and 45% of said air flow.
  • each of the diodes 24 When each of the diodes 24 is supplied with electricity, it emits laser radiation which is sent to the conversion device 16 by the reflector 26 which forms a scanning system. Several points of the layer 38 of phosphor therefore successively receive the laser radiation from one of the diodes 24.
  • each point of layer 38 receiving the monochromatic and coherent "blue” laser radiation, re-emits light considered to be "white", that is to say comprising a plurality of wavelengths between 400 nm and about 800 nm.
  • the optical imaging system 18 then forms an image of the light points of the phosphor layer 38 at infinity, in the form of a light beam capable of illuminating the road in front of a vehicle.
  • the wavelength conversion process causes the plate 36 of the conversion device 16 to heat up. Furthermore, the heat diffused by each diode 24 is dissipated in the corresponding radiator 32.
  • the fan 20 generates an air flow divided into three distinct flows in each of the ducts 66, 68 and 70. Each of said air flows cools the plate 36 or one of the radiators 32, preventing the module 10 from overheating.
  • the shape of the housing 44 allows the formation in parallel of three separate air flows from a single fan 20. It is thus possible to modulate the quantity of air directed onto each of the elements of the module 10 likely to heat up. in operation.

Description

La présente invention concerne un module d'éclairage de projecteur de véhicule automobile, du type comprenant : au moins une première source lumineuse ; un dispositif de conversion de longueur d'onde de la lumière émise par ladite première source lumineuse ; et un ventilateur apte à générer un débit d'air.The present invention relates to a motor vehicle headlamp lighting module, of the type comprising: at least one first light source; a device for converting the wavelength of the light emitted by said first light source; and a fan able to generate an air flow.

Il est connu de prévoir, à l'avant d'un véhicule automobile, des projecteurs aptes à former des faisceaux lumineux pour remplir différentes fonctions d'éclairage, par exemple de type « feux de route » ou « feux de croisement ».It is known to provide, at the front of a motor vehicle, headlamps capable of forming light beams to fulfill different lighting functions, for example of the "main beam" or "dipped beam" type.

Des dispositifs de feux, dits adaptatifs, permettent d'ajuster l'intensité, les dimensions et/ou la direction des faisceaux selon les conditions de circulation, afin de remplir ces différentes fonctions.So-called adaptive light devices make it possible to adjust the intensity, dimensions and/or direction of the beams according to traffic conditions, in order to fulfill these different functions.

Chaque projecteur comporte en général plusieurs modules d'éclairage qui permettent de former un faisceau lumineux du projecteur. Les modules peuvent être allumés ou éteints indépendamment les uns des autres pour faire varier en temps réel les caractéristiques du faisceau.Each headlamp generally comprises several lighting modules which make it possible to form a light beam from the headlamp. The modules can be switched on or off independently of each other to vary the characteristics of the beam in real time.

On entend par module d'éclairage un ensemble contenant au moins une source lumineuse et un système optique de projection ou de réflexion.By lighting module is meant an assembly containing at least one light source and an optical projection or reflection system.

Le document US 2011 280033 A1 décrit un module lumineux comportant plusieurs sources de lumière dont la lumière est guidée vers un dispositif de conversion de longueur d'onde, ce dernier étant refroidi par de l'air envoyé par un ventilateur dans un conduit d'air.The document US 2011 280033 A1 describes a light module comprising several light sources whose light is guided towards a wavelength conversion device, the latter being cooled by air sent by a fan into an air duct.

Des modules d'éclairage, tels que décrits dans le document EP2690352 au nom de la Demanderesse, comprennent notamment des dispositifs lumineux comportant des sources lumineuses de type diodes laser, émettant en lumière bleue, ainsi qu'un dispositif apte à convertir le rayonnement laser en un faisceau de lumière blanche. Un tel dispositif de conversion est par exemple constitué d'éléments de luminophore.Lighting modules, as described in the document EP2690352 in the name of the Applicant, comprise in particular light devices comprising light sources of the laser diode type, emitting blue light, as well as a device capable of converting the laser radiation into a beam of white light. Such a conversion device is for example made up of phosphor elements.

Les sources lumineuses et le dispositif de conversion générant une chaleur importante en fonctionnement, il est nécessaire de les refroidir. Il est notamment connu d'équiper les modules d'éclairage de ventilateurs qui génèrent un flux d'air apte à refroidir par convection les éléments chauffants.Since the light sources and the conversion device generate significant heat in operation, it is necessary to cool them. It is in particular known to equip the lighting modules with fans which generate a flow of air capable of cooling the heating elements by convection.

La présence d'un ventilateur pour chacun des éléments précités permet un refroidissement optimal. Cette solution est cependant coûteuse.The presence of a fan for each of the aforementioned elements allows optimal cooling. However, this solution is expensive.

La présente invention a pour but de proposer une amélioration des modules d'éclairage existants, en optimisant notamment l'efficacité du refroidissement des différents éléments émettant de la chaleur.The object of the present invention is to propose an improvement of existing lighting modules, in particular by optimizing the efficiency of the cooling of the various elements emitting heat.

A cet effet, la présente invention, telle que définie dans la revendication 1, se rapporte à un module d'éclairage du type précité, comportant au moins un premier et un deuxième conduits d'air distincts, le ventilateur étant placé en entrée de chacun desdits premier et deuxième conduits d'air de sorte à répartir le débit d'air entre lesdits conduits, la première source lumineuse et le dispositif de conversion de longueur d'onde étant respectivement disposés en sortie du premier et du deuxième conduits d'air.To this end, the present invention, as defined in claim 1, relates to a lighting module of the aforementioned type, comprising at least a first and a second distinct air ducts, the fan being placed at the inlet of each of said first and second air ducts of so as to distribute the air flow between said ducts, the first light source and the wavelength conversion device being respectively arranged at the outlet of the first and second air ducts.

Suivant d'autres aspects avantageux de l'invention, le module d'éclairage comporte l'une ou plusieurs des caractéristiques suivantes, prises isolément ou suivant toutes les combinaisons techniquement possibles :

  • le module d'éclairage comporte au moins une deuxième source lumineuse, le dispositif de conversion étant apte à recevoir la lumière émise par ladite deuxième source lumineuse, ledit module d'éclairage comportant au moins un troisième conduit d'air distinct des premier et deuxième conduits d'air, le ventilateur étant placé en entrée dudit troisième conduit d'air de sorte à répartir le débit d'air entre lesdits conduits, la deuxième source lumineuse étant disposée en sortie dudit troisième conduit d'air ;
  • les conduits d'air sont configurés de sorte à diriger sur le dispositif de conversion de longueur d'onde une fraction comprise entre 10% et 40%, préférentiellement entre 15% et 25%, du débit d'air généré par le ventilateur ;
  • au moins la première source lumineuse est au contact d'un radiateur apte à échanger de la chaleur avec un flux d'air, ledit radiateur étant disposé dans le conduit d'air correspondant à ladite source lumineuse ;
  • au moins la première source lumineuse est une source lumineuse à semi-conducteurs, de préférence une diode laser, émettant un rayonnement dont la longueur d'onde est préférentiellement comprise entre 400 nm et 500 nm ;
  • le dispositif de conversion de longueur d'onde comporte une plaque réfléchissante au rayonnement laser et une couche de luminophore recouvrant ladite plaque ;
  • le module d'éclairage comporte en outre au moins un dispositif réflecteur apte à dévier la lumière émise par au moins la première source lumineuse et à renvoyer ladite lumière sur le dispositif de conversion de longueur d'onde ;
  • le module d'éclairage comporte en outre un système optique d'imagerie apte à projeter la lumière réémise par le dispositif de conversion de longueur d'onde.
According to other advantageous aspects of the invention, the lighting module comprises one or more of the following characteristics, taken in isolation or in all technically possible combinations:
  • the lighting module comprises at least a second light source, the conversion device being capable of receiving the light emitted by said second light source, said lighting module comprising at least a third air duct separate from the first and second ducts air, the fan being placed at the inlet of said third air duct so as to distribute the air flow between said ducts, the second light source being placed at the outlet of said third air duct;
  • the air ducts are configured so as to direct onto the wavelength conversion device a fraction of between 10% and 40%, preferably between 15% and 25%, of the airflow generated by the fan;
  • at least the first light source is in contact with a radiator capable of exchanging heat with a flow of air, said radiator being placed in the air duct corresponding to said light source;
  • at least the first light source is a semiconductor light source, preferably a laser diode, emitting radiation whose wavelength is preferably between 400 nm and 500 nm;
  • the wavelength conversion device comprises a plate reflecting laser radiation and a phosphor layer covering said plate;
  • the lighting module further comprises at least one reflector device capable of deflecting the light emitted by at least the first light source and of returning said light to the wavelength conversion device;
  • the lighting module further comprises an optical imaging system capable of projecting the light re-emitted by the wavelength conversion device.

L'invention se rapporte en outre à un projecteur de véhicule automobile, comprenant au moins un module d'éclairage tel que décrit ci-dessus.The invention also relates to a motor vehicle headlamp, comprising at least one lighting module as described above.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif et faite en se référant aux dessins sur lesquels :

  • la figure 1 est une vue en coupe d'un module d'éclairage selon un mode de réalisation de l'invention ;
  • la figure 2 est une vue en perspective éclatée d'éléments du module d'éclairage de la figure 1 ; et
  • la figure 3 est une vue de dos d'un élément du module d'éclairage de la figure 1.
The invention will be better understood on reading the following description, given solely by way of non-limiting example and made with reference to the drawings in which:
  • there figure 1 is a sectional view of a lighting module according to one embodiment of the invention;
  • there picture 2 is an exploded perspective view of elements of the lighting module of the figure 1 ; And
  • there picture 3 is a rear view of an element of the lighting module of the figure 1 .

La figure 1 représente en coupe un module d'éclairage 10 selon un mode de réalisation de l'invention.There figure 1 shows in section a lighting module 10 according to one embodiment of the invention.

Le module d'éclairage 10 est destiné à être incorporé dans un projecteur de véhicule automobile, ledit projecteur comprenant éventuellement un ou plusieurs autres modules d'éclairage.The lighting module 10 is intended to be incorporated in a motor vehicle headlamp, said headlamp optionally comprising one or more other lighting modules.

Le module d'éclairage 10 comporte un premier 12 et un second 14 dispositifs lumineux, un dispositif 16 de conversion de longueur d'onde et un système optique 18 d'imagerie.The lighting module 10 comprises a first 12 and a second 14 light devices, a wavelength conversion device 16 and an optical system 18 for imaging.

Le module 10 comporte en outre un ventilateur 20, apte à générer un débit d'air.The module 10 further comprises a fan 20, able to generate an air flow.

Le module 10 comporte en outre un support 22 auquel sont fixés les premier 12 et second 14 dispositifs lumineux, le dispositif de conversion 16, le système optique 18 et le ventilateur 20.The module 10 further comprises a support 22 to which are fixed the first 12 and second 14 light devices, the conversion device 16, the optical system 18 and the fan 20.

On considère une base orthonormée (X, Y, Z) représentée aux figures 1, 2 et 3. Les axes horizontaux X et Y sont respectivement parallèle et perpendiculaire à un axe optique 23 du système optique 18 ; l'axe Z est vertical.We consider an orthonormal basis (X, Y, Z) represented in figure 1 , 2 and 3 . The horizontal axes X and Y are respectively parallel and perpendicular to an optical axis 23 of the optical system 18; the Z axis is vertical.

Dans l'exemple de la figure 1, les premier 12 et second 14 dispositifs lumineux sont sensiblement identiques et correspondent à la même description ci-dessous.In the example of the figure 1 , the first 12 and second 14 light devices are substantially identical and correspond to the same description below.

Les dispositifs lumineux 12, 14 comportent chacun une source lumineuse 24 disposée selon un axe d'émission sensiblement parallèle à X. Préférentiellement, la source lumineuse 24 est une source lumineuse à semi-conducteurs, plus préférentiellement une diode laser. Dans l'exemple de la figure 1, la source lumineuse 24 de chacun des dispositifs lumineux 12, 14 est une diode laser.The light devices 12, 14 each comprise a light source 24 arranged along an emission axis substantially parallel to X. Preferably, the light source 24 is a semiconductor light source, more preferably a laser diode. In the example of the figure 1 , the light source 24 of each of the light devices 12, 14 is a laser diode.

La diode laser 24 émet par exemple un faisceau visible dont la longueur d'onde est comprise entre 400 nm et 500 nm, de préférence comprise entre 440 nm et 470 nm.The laser diode 24 for example emits a visible beam whose wavelength is between 400 nm and 500 nm, preferably between 440 nm and 470 nm.

Les dispositifs lumineux 12, 14 comportent en outre chacun un dispositif optique apte à concentrer le faisceau émis par la diode laser 24.The light devices 12, 14 each further comprise an optical device capable of concentrating the beam emitted by the laser diode 24.

Les dispositifs lumineux 12, 14 comportent en outre chacun un réflecteur 26 apte à envoyer vers le dispositif de conversion 16 un rayon lumineux émis par la diode laser 24 et concentré par le dispositif optique. De préférence, le réflecteur 26 est mobile selon une ou deux directions, de sorte à former un système de balayage. Dans l'exemple de la figure 1, le réflecteur 26 est formé de plusieurs miroirs mobiles de manière indépendante. Le déplacement des miroirs du réflecteur est notamment contrôlé par une carte électronique 28.The light devices 12, 14 each further comprise a reflector 26 able to send to the conversion device 16 a light ray emitted by the laser diode 24 and concentrated by the optical device. Preferably, the reflector 26 is movable in one or two directions, so as to form a scanning system. In the example of the figure 1 , the reflector 26 is formed of several independently movable mirrors. The movement of the mirrors of the reflector is notably controlled by an electronic card 28.

Les dispositifs lumineux 12, 14 comportent en outre chacun une enveloppe 30, renfermant la diode 24, le dispositif optique et le réflecteur 26 ; et un échangeur de chaleur 32, assemblé à la diode 24. L'échangeur de chaleur 32 est préférentiellement un radiateur à ailettes réalisé dans un matériau à bonne conductivité thermique tel que l'aluminium.The luminous devices 12, 14 further each comprise an envelope 30, containing the diode 24, the optical device and the reflector 26; and a heat exchanger 32, assembled to the diode 24. The heat exchanger 32 is preferably a finned radiator made of a material with good thermal conductivity such as aluminum.

L'enveloppe 30 comporte un orifice latéral 34 permettant la sortie du rayon lumineux émis par la diode 24 et dévié par le réflecteur 26, vers le dispositif 16 de conversion de longueur d'onde.The envelope 30 has a side orifice 34 allowing the output of the light ray emitted by the diode 24 and deflected by the reflector 26, towards the device 16 for wavelength conversion.

Le dispositif 16 de conversion de longueur d'onde est par exemple formé d'une plaque 36 d'un substrat réfléchissant pour le rayonnement laser, sur lequel est déposée une couche continue et homogène 38 de luminophore. La plaque 36 est par exemple réalisée en aluminium.The wavelength conversion device 16 is for example formed of a plate 36 of a substrate reflecting the laser radiation, on which is deposited a continuous and homogeneous layer 38 of phosphor. The plate 36 is for example made of aluminum.

La couche 38 de luminophore est disposée dans un plan (Y, Z). Les premier 12 et second 14 dispositifs lumineux sont respectivement disposés au-dessus et au-dessous, selon Z, de ladite couche 38.Phosphor layer 38 is arranged in a plane (Y, Z). The first 12 and second 14 light devices are respectively arranged above and below, along Z, of said layer 38.

Le plan (Y, Z) de la couche 38 est proche d'un plan focal du système optique 18. Ledit système optique 18 comprend par exemple une ou plusieurs lentilles 40.The plane (Y, Z) of the layer 38 is close to a focal plane of the optical system 18. Said optical system 18 comprises for example one or more lenses 40.

Dans l'exemple de la figure 1, le support 22 du module d'éclairage 10 comporte deux éléments distincts, plus précisément une platine 42 et un boîtier 44. La platine 42, le boîtier 44 et le dispositif 16 de conversion de longueur d'onde sont représentés en perspective éclatée à la figure 2. Le boîtier 44 est représenté de dos à la figure 3.In the example of the figure 1 , the support 22 of the lighting module 10 comprises two distinct elements, more precisely a plate 42 and a housing 44. The plate 42, the housing 44 and the wavelength conversion device 16 are shown in exploded perspective in picture 2 . The box 44 is shown from the back to the picture 3 .

La platine 42 et le boîtier 44 sont assemblés l'un à l'autre, par exemple par vissage. La plaque 36 du dispositif 16 est maintenue entre la platine 42 et le boîtier 44 selon l'axe 23, la couche 38 de luminophore étant orientée vers la platine 42.The plate 42 and the housing 44 are assembled together, for example by screwing. Plate 36 of device 16 is held between plate 42 and housing 44 along axis 23, phosphor layer 38 being oriented towards plate 42.

La platine 42 a une forme sensiblement parallélépipédique avec des parois respectivement disposées selon des plans (X, Y), (X, Z) et (Y, Z).The plate 42 has a substantially parallelepipedal shape with walls respectively arranged along planes (X, Y), (X, Z) and (Y, Z).

La platine 42 comporte notamment une ouverture avant 48 et une ouverture arrière 50, respectivement ménagées dans chacune des deux parois disposées selon (Y, Z). La platine 42 est assemblée au système optique 18 au niveau de l'ouverture avant 48. La platine 42 est en outre assemblée à la plaque 36 du dispositif 16 de conversion de longueur d'onde, au niveau de l'ouverture arrière 50.The plate 42 notably comprises a front opening 48 and a rear opening 50, respectively made in each of the two walls arranged along (Y, Z). The plate 42 is assembled to the optical system 18 at the level of the front opening 48. The plate 42 is also assembled to the plate 36 of the wavelength conversion device 16, at the level of the rear opening 50.

La platine 42 comporte également une ouverture supérieure 52 et une ouverture inférieure 54, respectivement ménagées dans chacune des deux parois disposées selon (X, Y). La platine 42 est assemblée à chacun des premier 12 et second 14 dispositifs lumineux, au niveau respectivement de l'ouverture supérieure 52 et de l'ouverture inférieure 54. Chacune des ouvertures supérieure 52 et inférieure 54 est disposée en vis-à-vis de l'orifice latéral 34 de l'enveloppe 30 du dispositif lumineux 12, 14.Plate 42 also includes an upper opening 52 and a lower opening 54, respectively provided in each of the two walls arranged along (X, Y). The plate 42 is assembled to each of the first 12 and second 14 luminous devices, at the level of the upper opening 52 and the lower opening 54 respectively. the side orifice 34 of the casing 30 of the light device 12, 14.

Le boîtier 44 a également une forme sensiblement parallélépipédique. Le boîtier 44 comporte notamment un fond 60, disposé selon (Y, Z), et des parois externes latérales respectivement disposées selon (X, Y) et (X, Z).The housing 44 also has a substantially parallelepipedic shape. The case 44 notably comprises a bottom 60, arranged along (Y, Z), and external side walls respectively arranged along (X, Y) and (X, Z).

Par ailleurs, le boîtier 44 comporte deux parois internes 62, 64, disposées de part et d'autre d'un plan de symétrie (X, Y) dudit boîtier, ledit plan de symétrie passant par l'axe optique 23. Les parois internes 62, 64 s'appuient sur les parois externes latérales disposées selon (X, Z) du boîtier 44.Furthermore, the housing 44 comprises two internal walls 62, 64, arranged on either side of a plane of symmetry (X, Y) of said housing, said plane of symmetry passing through the optical axis 23. The internal walls 62, 64 rest on the outer side walls arranged along (X, Z) of the casing 44.

Les parois internes 62, 64 divisent l'intérieur du boîtier 44 en trois conduits distincts 66, 68 et 70, isolés les uns des autres et contigus selon Z. En particulier, le boîtier 44 comporte un conduit central 68 et deux conduits latéraux 66 et 70.The internal walls 62, 64 divide the interior of the casing 44 into three separate ducts 66, 68 and 70, isolated from each other and contiguous along Z. In particular, the casing 44 comprises a central duct 68 and two lateral ducts 66 and 70.

Le fond 60 du boîtier 44 comporte trois ouvertures 72, 74 et 76, contiguës selon Z. Chacune desdites ouvertures forme une entrée d'un conduit, respectivement 66, 68 et 70. Le ventilateur 20 est assemblé au fond 60 de sorte à recouvrir les ouvertures 72, 74 et 76. Ainsi, un débit d'air généré par le ventilateur 20 est réparti entre les trois conduits distincts 66, 68 et 70.The bottom 60 of the box 44 comprises three openings 72, 74 and 76, contiguous along Z. Each of said openings forms an inlet of a duct, respectively 66, 68 and 70. The fan 20 is assembled at the bottom 60 so as to cover the openings 72, 74 and 76. Thus, an air flow generated by the fan 20 is distributed between the three separate ducts 66, 68 and 70.

Le radiateur 32 de chacun des dispositifs lumineux 12, 14 est disposé à l'intérieur du boîtier 44, dans l'un des deux conduits latéraux 66 et 70. Ainsi, un flux d'air traversant chaque conduit latéral est apte à refroidir une diode 24 par l'intermédiaire du radiateur 32 correspondant.The radiator 32 of each of the luminous devices 12, 14 is arranged inside the casing 44, in one of the two side ducts 66 and 70. Thus, an air flow passing through each side duct is capable of cooling a diode 24 via the corresponding radiator 32.

La plaque 36 du dispositif de conversion 16 de conversion de longueur d'onde est disposée en sortie du conduit central 68, au contact des bords des parois internes 62, 64, opposés à l'ouverture 74. De préférence, le boîtier 44 comporte des trous 80 à proximité de la plaque 36, pour former une sortie d'air du conduit central 68.The plate 36 of the conversion device 16 for wavelength conversion is arranged at the outlet of the central duct 68, in contact with the edges of the internal walls 62, 64, opposite to the opening 74. Preferably, the housing 44 comprises holes 80 near plate 36, to form an air outlet from central duct 68.

Ainsi, un flux d'air traversant ledit conduit central 68 est apte à refroidir la plaque 36.Thus, a flow of air passing through said central duct 68 is capable of cooling plate 36.

De préférence, la position des parois internes 62, 64 est configurée de sorte à diriger sur la plaque 36 du dispositif de conversion 16 une fraction comprise entre 10% et 40%, préférentiellement entre 15% et 25%, du débit d'air généré par le ventilateur 20. Chaque radiateur 32 reçoit donc entre 30% et 45% dudit débit d'air.Preferably, the position of the internal walls 62, 64 is configured so as to direct onto the plate 36 of the conversion device 16 a fraction comprised between 10% and 40%, preferably between 15% and 25%, of the air flow generated by the fan 20. Each radiator 32 therefore receives between 30% and 45% of said air flow.

Un procédé de fonctionnement du module d'éclairage 10 va maintenant être décrit. Lorsque chacune des diodes 24 est alimentée en électricité, elle émet un rayonnement laser qui est envoyé vers le dispositif de conversion 16 par le réflecteur 26 qui forme un système de balayage. Plusieurs points de la couche 38 de luminophore reçoivent donc successivement le rayonnement laser d'une des diodes 24.A method of operating the lighting module 10 will now be described. When each of the diodes 24 is supplied with electricity, it emits laser radiation which is sent to the conversion device 16 by the reflector 26 which forms a scanning system. Several points of the layer 38 of phosphor therefore successively receive the laser radiation from one of the diodes 24.

De manière connue, chaque point de la couche 38, recevant le rayonnement laser « bleu » monochromatique et cohérent, réémet une lumière considérée comme « blanche », c'est-à-dire comportant une pluralité de longueurs d'onde comprise entre 400 nm et 800 nm environ.In known manner, each point of layer 38, receiving the monochromatic and coherent "blue" laser radiation, re-emits light considered to be "white", that is to say comprising a plurality of wavelengths between 400 nm and about 800 nm.

Le système optique 18 d'imagerie forme alors à l'infini une image des points lumineux de la couche 38 de luminophore, sous forme d'un faisceau lumineux apte à éclairer la route à l'avant d'un véhicule.The optical imaging system 18 then forms an image of the light points of the phosphor layer 38 at infinity, in the form of a light beam capable of illuminating the road in front of a vehicle.

Le procédé de conversion de longueur d'onde provoque un échauffement de la plaque 36 du dispositif de conversion 16. Par ailleurs, la chaleur diffusée par chaque diode 24 est dissipée dans le radiateur 32 correspondant.The wavelength conversion process causes the plate 36 of the conversion device 16 to heat up. Furthermore, the heat diffused by each diode 24 is dissipated in the corresponding radiator 32.

Le ventilateur 20 génère un débit d'air réparti en trois flux distincts dans chacun des conduits 66, 68 et 70. Chacun desdits flux d'air refroidit la plaque 36 ou l'un des radiateurs 32, évitant une surchauffe du module 10.The fan 20 generates an air flow divided into three distinct flows in each of the ducts 66, 68 and 70. Each of said air flows cools the plate 36 or one of the radiators 32, preventing the module 10 from overheating.

La forme du boîtier 44 permet la formation en parallèle de trois flux d'air distincts à partir d'un unique ventilateur 20. Il est ainsi possible de moduler la quantité d'air dirigée sur chacun des éléments du module 10 susceptible de s'échauffer en cours de fonctionnement.The shape of the housing 44 allows the formation in parallel of three separate air flows from a single fan 20. It is thus possible to modulate the quantity of air directed onto each of the elements of the module 10 likely to heat up. in operation.

Claims (9)

  1. Motor vehicle headlight lighting module (10) comprising:
    - at least one first light source (24), and possibly a second light source (24);
    - a device (16) for converting the wavelength of the light emitted by said first light source (24), the converter device possibly being able to receive the light emitted by said possible second light source (24); and
    - a fan (20) able to generate a flow of air;
    the lighting module being characterized in that it includes at least one first air duct (66) and one second air duct (68) that are separate, the fan being placed at the inlet (72, 74) of each of said first and second air ducts so as to distribute the flow of air between said ducts, the first light source and the wavelength converter device being disposed at the outlet of the first and second air ducts, respectively,
    and in that it comprises a support (22) to which the fan, the wavelength converter device, the first light source and where applicable the second light source (24) are fixed, said support comprising one or more internal walls (62, 64) defining the air ducts (66, 68).
  2. Lighting module according to Claim 1, including at least one second light source (24), the converter device being able to receive the light emitted by said second light source,
    said lighting module including at least one third air duct (70) separate from the first air duct (66) and the second air duct (68), the fan (20) being placed at the inlet (76) of said third air duct (70) so as to distribute the flow of air between said ducts (66, 68, 70), the second light source (24) being disposed at the outlet of said third air duct (70).
  3. Lighting module according to one of the preceding claims, wherein the air ducts (66, 68, 70) are configured so as to direct onto the wavelength converter device (16) a fraction between 10% and 40% inclusive, preferably between 15% and 25% inclusive, of the flow of air generated by the fan.
  4. Lighting module according to one of the preceding claims, wherein at least the first light source (24) is in contact with a heatsink (32) able to exchange heat with a flow of air, said heatsink being disposed in the air duct (66) corresponding to said light source.
  5. Lighting module according to one of the preceding claims, wherein at least the first light source (24) is a semiconductor light source, preferably a laser diode, emitting radiation the wavelength of which is preferably between 400 nm and 500 nm inclusive.
  6. Lighting module according to one of the preceding claims, wherein the wavelength converter device (16) includes a plate (36) reflecting the laser radiation and a layer (38) of luminophore covering said plate (36).
  7. Lighting module according to one of the preceding claims, further comprising at least one reflector device (26) able to deflect the light emitted by at least the first light source and to redirect said light onto the wavelength converter device (16).
  8. Lighting module according to one of the preceding claims, further comprising an optical imaging system (18) able to project the light re-emitted by the wavelength converter device (16).
  9. Motor vehicle headlight including at least one lighting module (10) according to one of the preceding claims.
EP16200007.9A 2015-11-27 2016-11-22 Lighting module of a motor vehicle headlight and associated headlight Active EP3173684B1 (en)

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FR1561525A FR3044393B1 (en) 2015-11-27 2015-11-27 MOTOR VEHICLE PROJECTOR LIGHTING MODULE AND PROJECTOR

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FR3044393B1 (en) 2019-04-26
EP3173684A1 (en) 2017-05-31
US10309636B2 (en) 2019-06-04
US20170153002A1 (en) 2017-06-01
FR3044393A1 (en) 2017-06-02
CN106813184A (en) 2017-06-09
CN106813184B (en) 2021-08-10

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